HttpModule AcquireRequestState 事件处理程序的发送者为空
我有一个 HttpModule，如下所示：
public class MyModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.AcquireRequestState += Context_OnAcquireRequestState;
}
private void Context_OnAcquireRequestState(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
... etc
}
}
我注意到应用程序池重新启动后立即出现问题，其中 null 作为 AcquireRequestState 事件的 sender 参数传递，并且我收到 null 引用异常。 一段时间后，问题似乎自行解决。
怎么会发生这种事？
I have an HttpModule, something like this:
public class MyModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.AcquireRequestState += Context_OnAcquireRequestState;
}
private void Context_OnAcquireRequestState(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
... etc
}
}
I have noticed a problem occurring directly after the app pool is restarted, in which null is passed as the sender parameter of the AcquireRequestState event and I get a null reference exception.
After some time the problem seems to resolve itself.
How could this be happening?
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HttpContext.Current 应由基础结构在事件处理程序线程上设置。尝试在事件中使用静态访问器而不是发送者。
HttpContext.Current should be set on the event handler thread by the infrastructure. Try using the static accessor instead of the sender on the event.